The dielectric constant for air is 1.006. The speed of em wave travelling in air is `axx10^8ms^-1`, where a is about:

Dielectric constnat of air is 1.005 and velocity of electromagnetic wave propagating in air is a xx 10^(10)cm//s then a = …….

Orange light of wavelength 6600 Å travelling in air gets refracted in water. If the speed of light in air is 3xx10^(8)ms^(-1) and refractive index of water is 4/3, find : (i) the frequency of light in air, (ii) the speed of light in water, and (iii) the wavelength of light in water.

Light enters from air to diamond with refractive index 2.42 What is the speed of light in diamond ? Given, speed light in air is 3xx10^8ms^(-1) .